<template>
	<view class="u-markdown">
		<rich-text space="nbsp" :nodes="parsedNodes" @itemclick="handleItemClick"></rich-text>
	</view>
</template>
<script>

/**
 * markdown 
 * @description 该组件用于解析markdown内容
 * @tutorial https://uviewui.com/components/markdown.html
 * @property {String}   content				渲染解析内容
 * @property {Boolean}	showLine			是否显示代码块行号
 * @example <u-markdown :content="content" :showLine="showLine" ></u-markdown>
 */

import props from './props.js';
import mixin from '../../libs/mixin/mixin'
import mpMixin from '../../libs/mixin/mpMixin'
import MarkdownIt from './markdown/markdown-it.min.js'
import hljs from './highlight/uni-highlight.min.js'
import './highlight/atom-one-dark.css'

// #ifdef APP-NVUE
import parseHtml from './parser.js'
// #endif

export default {
	name: "u-markdown",
	mixins: [mpMixin, mixin, props],
	data() {
		return {
			copyCodeData: [],
			markdown: null,
			highlight: null,
			latex: null,
		}
	},
	computed: {
		parsedNodes() {
			return this.parseNodes(this.content)
		}
	},
	created() {
		this.init()
	},
	methods: {
		init() {
			let that = this;
			that.markdown = MarkdownIt({
				html: true,
				highlight: function (str, lang) {
					let preCode = ''
					try {
						preCode = hljs.highlightAuto(str).value
					} catch (err) {
						preCode = that.markdown.utils.escapeHtml(str)
					}
					const lines = preCode.split(/\n/).slice(0, -1)
					// 添加自定义行号
					let html = lines
						.map((item, index) => {
							if (item == '') {
								return ''
							}
							return (
								'<li><span class="line-num" data-line="' +
								(index + 1) +
								'"></span>' +
								item +
								'</li>'
							)
						})
						.join('')
					if (that.showLine) {
						html = '<ol style="padding: 0px 30px;">' + html + '</ol>'
					} else {
						html = '<ol style="padding: 0px 7px;list-style:none;">' + html + '</ol>'
					}
					
					that.copyCodeData = str

					let htmlCode = `<div class="markdown-wrap">`
					// #ifndef MP-WEIXIN
					htmlCode += `<div style="color: #aaa;text-align: right;font-size: 12px;padding:8px;">`
					htmlCode += `${lang}<a class="copy-btn" code-data-index="${that.copyCodeData.length - 1}" style="margin-left: 8px;">复制代码</a>`
					htmlCode += `</div>`
					// #endif
					htmlCode += `<pre class="hljs"><code>${html}</code></pre>`
					htmlCode += '</div>'
					return htmlCode
				}
			});

			// 自定义表格渲染规则，添加横向滚动包装器
			that.markdown.renderer.rules.table_open = function (tokens, idx, options, env, slf) {
				return '<div class="table-wrapper"><table class="table">';
			};

			that.markdown.renderer.rules.table_close = function (tokens, idx, options, env, slf) {
				return '</table></div>';
			};

			// 自定义表格行渲染规则
			that.markdown.renderer.rules.tr_open = function (tokens, idx, options, env, slf) {
				return '<tr class="tr">';
			};

			that.markdown.renderer.rules.tr_close = function (tokens, idx, options, env, slf) {
				return '</tr>';
			};

			// 自定义表格单元格渲染规则
			that.markdown.renderer.rules.td_open = function (tokens, idx, options, env, slf) {
				return '<td class="td">';
			};

			that.markdown.renderer.rules.td_close = function (tokens, idx, options, env, slf) {
				return '</td>';
			};

			// 自定义表头单元格渲染规则
			that.markdown.renderer.rules.th_open = function (tokens, idx, options, env, slf) {
				return '<th class="th">';
			};

			that.markdown.renderer.rules.th_close = function (tokens, idx, options, env, slf) {
				return '</th>';
			};

		},
		parseNodes(value) {
			if (!value) return
			// 解析<br />到\n
			value = value.replace(/<br>|<br\/>|<br \/>/g, '\n')
			value = value.replace(/&nbsp;/g, ' ')
			let htmlString = ''
			if (value.split('```').length % 2) {
				let mdtext = value
				if (mdtext[mdtext.length - 1] != '\n') {
					mdtext += '\n'
				}
				htmlString = this.markdown.render(mdtext)
			} else {
				htmlString = this.markdown.render(value)
			}
		
			// #ifndef APP-NVUE
			return htmlString
			// #endif

			// 将htmlString转成htmlArray，反之使用rich-text解析
			// #ifdef APP-NVUE
			return parseHtml(htmlString)
			// #endif
		},
		handleItemClick(e) {
			let { attrs } = e.detail.node
			let { 'code-data-index': codeDataIndex, class: className } = attrs
			if (className == 'copy-btn') {
				uni.setClipboardData({
					data: this.copyCodeData[codeDataIndex],
					showToast: false,
					success() {
						uni.showToast({
							title: '复制成功',
							icon: 'none'
						})
					}
				})
			}
		}
	}
}
</script>

<style lang="scss" scoped>
@import '../../libs/css/components.scss';

.u-markdown {
	font-size: 14px;
	line-height: 1.5;
	word-break: break-all;

	h1,
	h2,
	h3,
	h4,
	h5,
	h6 {
		font-family: inherit;
		font-weight: 500;
		line-height: 1.1;
		color: inherit;
	}

	h1,
	h2,
	h3 {
		margin-top: 20px;
		margin-bottom: 10px;
	}

	h4,
	h5,
	h6 {
		margin-top: 10px;
		margin-bottom: 10px;
	}

	.h1,
	h1 {
		font-size: 36px;
	}

	.h2,
	h2 {
		font-size: 30px;
	}

	.h3,
	h3 {
		font-size: 24px;
	}

	.h4,
	h4 {
		font-size: 18px;
	}

	.h5,
	h5 {
		font-size: 14px;
	}

	.h6,
	h6 {
		font-size: 12px;
	}

	a {
		background-color: transparent;
		color: #2196f3;
		text-decoration: none;
	}

	hr,
	::v-deep .hr {
		margin-top: 20px;
		margin-bottom: 20px;
		border: 0;
		border-top: 1px solid #e5e5e5;
	}

	img {
		max-width: 35%;
	}

	p {
		margin: 0 0 10px;
	}

	em {
		font-style: italic;
		font-weight: inherit;
	}

	ol,
	ul {
		margin-top: 0;
		margin-bottom: 10px;
		padding-left: 40px;
	}

	ol ol,
	ol ul,
	ul ol,
	ul ul {
		margin-bottom: 0;
	}

	ol ol,
	ul ol {
		list-style-type: lower-roman;
	}

	ol ol ol,
	ul ul ol {
		list-style-type: lower-alpha;
	}

	dl {
		margin-top: 0;
		margin-bottom: 20px;
	}

	dt {
		font-weight: 600;
	}

	dt,
	dd {
		line-height: 1.4;
	}

	.task-list-item {
		list-style-type: none;
	}

	.task-list-item input {
		margin: 0 0.2em 0.25em -1.6em;
		vertical-align: middle;
	}

	pre {
		position: relative;
		z-index: 11;
	}

	code,
	kbd,
	pre,
	samp {
		font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
	}

	code:not(.hljs) {
		padding: 2px 4px;
		font-size: 90%;
		color: #c7254e;
		background-color: #ffe7ee;
		border-radius: 4px;
	}

	code:empty {
		display: none;
	}

	pre code.hljs {
		color: var(--vg__text-1);
		border-radius: 16px;
		background: var(--vg__bg-1);
		font-size: 12px;
	}

	.markdown-wrap {
		font-size: 12px;
		margin-bottom: 10px;
	}

	pre.code-block-wrapper {
		background: #2b2b2b;
		color: #f8f8f2;
		border-radius: 4px;
		overflow-x: auto;
		padding: 1em;
		position: relative;
	}

	pre.code-block-wrapper code {
		padding: auto;
		font-size: inherit;
		color: inherit;
		background-color: inherit;
		border-radius: 0;
	}

	.code-block-header__copy {
		font-size: 16px;
		margin-left: 5px;
	}

	abbr[data-original-title],
	abbr[title] {
		cursor: help;
		border-bottom: 1px dotted #777;
	}

	blockquote {
		padding: 10px 20px;
		margin: 0 0 20px;
		font-size: 17.5px;
		border-left: 5px solid #e5e5e5;
	}

	blockquote ol:last-child,
	blockquote p:last-child,
	blockquote ul:last-child {
		margin-bottom: 0;
	}

	blockquote .small,
	blockquote footer,
	blockquote small {
		display: block;
		font-size: 80%;
		line-height: 1.42857143;
		color: #777;
	}

	blockquote .small:before,
	blockquote footer:before,
	blockquote small:before {
		content: '\2014 \00A0';
	}

	.blockquote-reverse,
	blockquote.pull-right {
		padding-right: 15px;
		padding-left: 0;
		text-align: right;
		border-right: 5px solid #eee;
		border-left: 0;
	}

	.blockquote-reverse .small:before,
	.blockquote-reverse footer:before,
	.blockquote-reverse small:before,
	blockquote.pull-right .small:before,
	blockquote.pull-right footer:before,
	blockquote.pull-right small:before {
		content: '';
	}

	.blockquote-reverse .small:after,
	.blockquote-reverse footer:after,
	.blockquote-reverse small:after,
	blockquote.pull-right .small:after,
	blockquote.pull-right footer:after,
	blockquote.pull-right small:after {
		content: '\00A0 \2014';
	}

	.footnotes {
		-moz-column-count: 2;
		-webkit-column-count: 2;
		column-count: 2;
	}

	.footnotes-list {
		padding-left: 2em;
	}

	::v-deep .table-wrapper {
		width: 100%;
		overflow-x: auto;
		border-radius: 8px;
		border: 1px solid #e5e5e5;
	}
	
	::v-deep .table-wrapper::-webkit-scrollbar {
		display: none;
	}

	::v-deep .table-wrapper .table {
		border-spacing: 0;
		border-collapse: collapse;
		width: 100%;
		min-width: 100%;
	}

	::v-deep .table-wrapper .table .th,
	::v-deep .table-wrapper .table .td {
		padding: 8px 10px;
		border-bottom: 1px solid #e5e5e5;
		border-right: 1px solid #e5e5e5;
		white-space: nowrap;
		text-align: left;
		vertical-align: middle;
		min-width: 100%;
	}
	::v-deep .table-wrapper .table .tr:last-child .td {
		border-bottom: none;
	}

	::v-deep .table-wrapper .table .tr .td:last-child {
		border-right: none;
	}

	::v-deep .table-wrapper .table .th {
		font-weight: 600;
		background-color: #f8f9fa;
		position: sticky;
		top: 0;
		z-index: 10;
	}

	::v-deep .hljs{
		padding:10px 8px 0;
		margin-bottom:5px;
		overflow: auto;
		display: block;
		border-radius: 5px;
	}

	.hljs[class*='language-']:before {
		position: absolute;
		z-index: 3;
		top: 0.8em;
		right: 1em;
		font-size: 0.8em;
		color: #999;
	}

	.hljs[class~='language-js']:before {
		content: 'js';
	}

	.hljs[class~='language-ts']:before {
		content: 'ts';
	}

	.hljs[class~='language-html']:before {
		content: 'html';
	}

	.hljs[class~='language-md']:before {
		content: 'md';
	}

	.hljs[class~='language-vue']:before {
		content: 'vue';
	}

	.hljs[class~='language-css']:before {
		content: 'css';
	}

	.hljs[class~='language-sass']:before {
		content: 'sass';
	}

	.hljs[class~='language-scss']:before {
		content: 'scss';
	}

	.hljs[class~='language-less']:before {
		content: 'less';
	}

	.hljs[class~='language-stylus']:before {
		content: 'stylus';
	}

	.hljs[class~='language-go']:before {
		content: 'go';
	}

	.hljs[class~='language-java']:before {
		content: 'java';
	}

	.hljs[class~='language-c']:before {
		content: 'c';
	}

	.hljs[class~='language-sh']:before {
		content: 'sh';
	}

	.hljs[class~='language-yaml']:before {
		content: 'yaml';
	}

	.hljs[class~='language-py']:before {
		content: 'py';
	}

	.hljs[class~='language-docker']:before {
		content: 'docker';
	}

	.hljs[class~='language-dockerfile']:before {
		content: 'dockerfile';
	}

	.hljs[class~='language-makefile']:before {
		content: 'makefile';
	}

	.hljs[class~='language-javascript']:before {
		content: 'js';
	}

	.hljs[class~='language-typescript']:before {
		content: 'ts';
	}

	.hljs[class~='language-markup']:before {
		content: 'html';
	}

	.hljs[class~='language-markdown']:before {
		content: 'md';
	}

	.hljs[class~='language-json']:before {
		content: 'json';
	}

	.hljs[class~='language-ruby']:before {
		content: 'rb';
	}

	.hljs[class~='language-python']:before {
		content: 'py';
	}

	.hljs[class~='language-bash']:before {
		content: 'sh';
	}

	.hljs[class~='language-php']:before {
		content: 'php';
	}
}
</style>
